Atomic Mass Flashcards
(15 cards)
How can atomic mass be measured
By using a mass spectrometer
What is a record of the mass distribution of particles in a sample?
Mass spectrum
What is the difference between elements and compounds?
Elements are the smallest unit of matter and a compound is composed of two or more elements and can be broken down by chemical means
Which type of mixture contains multiple phases?
Heterogeneous mixture
Which type of mixture consists of only a single phase?
Homogeneous
What contribution did John dalton make to the study of matter?
He came up with:
The law of definite composition
The law of multiple proportions
The atomic theory
What is the atomic mass unit defined by?
The atomic mass unit is 1/12 the mass of a carbon-12 atom
What is the law of definite composition?
The ratios of the masses of each element in a given compound are always the same. Compounds always have the same composition no matter where they are obtained.
What does the law of multiple proportions state?
When two elements combine to form one compound, the mass of one element that combines with the other element result in a ratio of small whole numbers.
A. Boiling point B. Texture C. Heavy D. Fireproof E. Brittle F. Rust resistant
A. Physical B. Physical C. Physical D. Chemical E. Physical F. Chemical
What are the four observations that tell us when a chemical change has occurred?
- Liberation or absorption of heat/energy
- Distinct change in color
- Formation of a gas
- Formation of a precipitate
(Two easies and two formations)
Which of the three basic subatomic particles is the least massive?
An electron
What is the difference between atomic number and mass number
Atomic number (z) refers to the amount of protons in an atom and mass number (a) refers to the sum of protons plus neutrons
What is an isotope?
An isotope is an element that has the same mass number but a different atomic number (number of protons) to find the number of neutrons in an isotope you subtract the atomic number number from the mass number (found above the element letter) .
What is an ion?
An ion is a negatively charged particle m
